EMG vs. Imaging (MRI/CT): When Each Test Is Needed

Introduction
Providers often face the challenge of deciding whether a patient needs an EMG/NCS or imaging such as MRI/CT. While both provide valuable information, their roles are complementary rather than interchangeable.

MRI/CT Strengths

• Excellent for structural visualization (herniated discs, tumors, fractures).
• Best when ruling out anatomical causes of nerve compression.

EMG/NCS Strengths

• Evaluates the function of nerves and muscles.
• Detects whether compression is producing active dysfunction.
• Differentiates neuropathy, radiculopathy, and myopathy.

When to Order EMG/NCS Over Imaging

• Symptoms of neuropathy without clear imaging findings.
• To confirm nerve root involvement when MRI findings are nonspecific.
• To assess severity and chronicity of nerve damage.

MRI shows anatomy; EMG shows physiology. When combined, they provide the most accurate diagnosis and treatment planning.

Integrity Diagnostics offers EMG/NCS with rapid turnaround reports to complement your imaging findings. Contact us today for referral details.